<template>
  <div class="wrapper" ref="wrapper">
    <div>
      <slot></slot>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll';
export default {
  name: "Scroll",
  props: {
    probeType: {
      type: Number,
      default: 0
    },
    pullUpLoad: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      scroll: null
    }
  },
  mounted() {
    // 1. 创建 BScroll 对象
    this.scroll = new BScroll(this.$refs.wrapper, {
      probeType: this.probeType,
      pullUpLoad: this.pullUpLoad,
      click: true
    })
    // 2.监听滚动的位置
   if (this.probeType === 2 || this.probeType === 3) {
     this.scroll.on('scroll', (position) => {
       this.$emit('scroll', position)
     })
   }
    // 3.监听 scroll 滚动到 底部
   if (this.pullUpLoad) {
     this.scroll.on('pullingUp', () => {  //上拉加载更多
       this.$emit('pullingUp')
     })
   }
  },
  methods: {
    scrollTo(x,y, time=500) {
      this.scroll.scrollTo(x,y,time)
    },
    finishPullUp() {
      this.scroll.finishPullUp()
    },
    refresh() {
      this.scroll.refresh()
    }
  }
}
</script>

<style scoped>

</style>
